Electronic Unit Pump and High Pressure Common Rail Systems

Advantages of Electronic Unit Pump System

The working principle of the electronic unit pump is basically the same as that of the high-pressure common rail system. Both systems use sensors to feed back engine operating signals to the ECU, which then commands the opening and closing of solenoid valves to achieve precise control of injection timing and fuel injection quantity. The difference is that the common rail system controls the solenoid valve on the injector, while the electronic unit pump controls the solenoid valve on the oil pump.

Domestic oil quality has always been criticized. The high-pressure common rail system controls the solenoid valve on the injector, which has high requirements for oil quality. Dingbo Power reminds users that long-term use of inferior diesel will easily cause injector blockage and great damage to the system. The electronic unit pump controls the solenoid valve on the oil pump, and its injector is similar to that used in the previous mechanical pump, with a relatively large injector aperture, so its adaptability to oil quality can reach the level of the National II mechanical pump.

In addition, another advantage of the electronic unit pump is that most of its components still follow the design structure of the previous mechanical pump, with a very simple structure and the characteristic of one pump per cylinder. The nozzle and oil pump can be replaced separately, making maintenance very simple and convenient, and the maintenance cost is also low. According to the old technicians of Dingbo Power, the price of a set of high-pressure common rail system is much more expensive than that of the electronic unit pump, and due to the unqualified oil quality in many places, the high-pressure common rail system is more likely to be damaged than the electronic unit pump system.

Advantages of High Pressure Common Rail System

The electronically controlled high-pressure common rail fuel injection system is based on direct injection technology, pre-injection technology and electronic control technology. Through electronic closed-loop control of the fuel injection system, it realizes real-time changes of fuel injection quantity, injection timing, injection rate and shape according to the operating conditions of the diesel engine, optimizes the injection law, and enables the diesel engine to inject the appropriate amount of fuel at the correct time and at an appropriate pressure, so as to improve the power and fuel economy of the diesel engine, and reduce emissions and noise.

The high-pressure common rail system does have its own technical advantages, such as more precise injection control and stable fuel consumption at different speeds. However, domestic oil quality has not kept up with the pace, which has hindered the technology. Moreover, the state's environmental protection regulations are becoming increasingly strict, and the electronic unit pump may face more complex technical problems than the common rail system, but this is only for manufacturers. Therefore, for users, the advantages of the electronic unit pump are still very obvious.

Summary

Both technologies have their own advantages and disadvantages and their own markets. The high-pressure common rail system is mostly used in light vehicles, while the unit pump system is mostly used in heavy diesel vehicles. Generally speaking, the high-pressure common rail system saves fuel but is picky about oil, requiring the oil quality to meet the standards required for Euro III or above emissions, with expensive maintenance and reduced emissions. The unit pump system can use low-quality fuel, is not picky about fuel, and has cheap maintenance.

Guangxi Dingbo Generator Set Manufacturing Co.,Ltd. was founded in 1974 and is one of the earliest manufacturers of generators and diesel generator sets in China. If you want get more information, please feel free to send email to [email protected] we will pay highly attention on your question.